Firefox OS's Everything Search feature completely erases the lines between what is local to your device and what is on the web. When you want to find apps or documents, you can just type a single word and the results appear!

To create a consistent search experience for users, Firefox OS also provides a search framework for developers that that helps them implement search for their applications. (TBD Link)

Here's How:

Tap the home button.

Swipe to the left to open the search screen.

Search for something.

To go to the result, tap it.

To install an app to your phone, tap and hold the app icon and select Add to Homescreen.